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Why don't they make fans out of metal?

post #1 of 45
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I was just wondering why they don't do this, wouldn't it act as a heatsink and a fan?
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post #2 of 45
Metal 120mm fans = heavier, more expensive, more powerful motor, more dangerous blades, no benefit.

No, it would not act like a heatsink..... how would the heat get conducted to fan? Some very uneven contact from fins to the fan frame won't transfer much heat.
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post #3 of 45
Metal weighs more and would put more stress on the bearings, resulting in a shorter life expectancy.
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post #4 of 45
Well you got the wrong idea. It doesnt matter if fan is plastic, as it is before the actual heatsink.
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post #5 of 45
They do. Blades at least

http://www.newegg.com/Product/Produc...82E16835706022

The efficiency of the heat dissapation is lessened substantially the further you travel from the heatpipes. Which is why the blades are thin and plentiful; huge blades would not be efficient
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post #6 of 45
add cost to the above also.
They would have to be mad of lighweight metals, so aluminum and such, which costs more for no benifit.

Same reason their are pretty much no fans (except for industrial type) that are metal.
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post #7 of 45
They're called ninja stars
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post #8 of 45
Too expensive, too heavy, slow to manufacture and EXTREMELY dangerous. You can't even compare the pros and cons of this matter.
post #9 of 45
Balance is critical in a fan, the faster it spins the more important it is, the lighter the blades especially, the less effect on bearing(s) and motor.
You can buy a decent computer case for $50, a decent fan starts at $6-12, more or less each. And its not unusual to change out four or more. Yes fans are cheaper to make, a case costs a lot more to ship.
Generally expect to pay extra for quiet and air flow.
And life expectancy of moving parts.
Enermax uses a metal frame between plastic flanges on some of their fans, fwiw.
Edited by brasslad - 8/19/11 at 11:49am
post #10 of 45
Get a finger caught in one, then ask yourself that question. OUCH!
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